Module format and executor: 027's stage 3, nested stored state: a stored or a transient list's records may hold lists (a message's rows not, nor as a key); such a list's cell holds the value in its items' stored form (PURE_CELL_LIST, held as bytes are: each item's fields in order, 8 bytes a number, bool or i64, a u32le length and bytes a text or a list, a list's in this form again), read into one of the event's lists by ITEM_GET (counted in the event's room) and written from one by LIST_APPEND, LIST_INSERT and ITEM_SET, APPEND_IN reading, appending and writing back (undone with the event): images, the log, undoing, readers' shares and commits hold it as a text's bytes, so nothing new is stored or recovered; a list image's header names its record graph (a list field's items' record by its number, the graph's other records after the fields: a record holds itself through a list), and starting or replacing moves the items of the lists in fields by field name down the graph (PureLayout, pure_list_migrate); an event's lists keep the event's lists' numbers; a view lets go the lists a view before it read in; no FIND joined to a list field's read; pure-run shows a kept list's lists; unit tests (an event changing a number and a stored item's list, the process dying at the tree's four stages and the log's two, failed commits changing nothing; a replacement moving a stored and a transient list's lists, their items' record gaining a field and the board's fields changing places; under ASan and UBSan too)

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